The USRA Heavy Mikado was a

USRA standard The USRA standard locomotives and railroad cars were designed by the United States Railroad Administration, the nationalized rail system of the United States during World War I. 1,856 steam locomotives and over 100,000 railroad cars were built to ...

class of

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomot ...

designed under the control of the

United States Railroad Administration The United States Railroad Administration (USRA) was the name of the nationalisation, nationalized railroad system of the United States between December 28, 1917, and March 1, 1920. It was the largest American experiment with nationalization, and ...

(USRA), the nationalized railroad system in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

during

World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

. These locomotives were of

2-8-2 Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, eight powered and coupled driving wheels on four axles and two trailing wheel ...

wheel arrangement In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...

in the

Whyte notation Whyte notation is a classification method for steam locomotives, and some internal combustion locomotives and electric locomotives, by wheel arrangement. It was devised by Frederick Methvan Whyte, and came into use in the early twentieth ce ...

, or 1′D1′ in

UIC classification The UIC classification of locomotive axle arrangements, sometimes known as the German classification''The Railway Data File''. Leicester: Silverdale, 2000. p. 52. . or German system,Kalla-Bishop P.M. & Greggio, Luciano, ''Steam Locomotives'', Cre ...

. A total of 233 locomotives were built to this plan for the USRA; postwar, it became a ''de facto'' standard design, which was built to the total of 957 locomotives including the USRA originals and all subsequent copies.Huddleston (2002). Heavy Mikado used the same running gear as the

USRA Light Mikado The USRA Light Mikado was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I. This was the standard light fr ...

but were built to a higher axle load, larger cylinders and a much larger boiler for more power and steam-generating ability. Many aspects of the

PRR L1s Class L1s on the Pennsylvania Railroad comprised 574 2-8-2 "Mikado" type steam locomotives constructed between 1914 and 1919 by the railroad's own Juniata Shops (344 examples) as well as the Baldwin Locomotive Works (205) and the Lima Locomotive ...

class were carried over to the Heavy Mikado, although not that locomotive's distinctive

Belpaire firebox The Belpaire firebox is a type of firebox used on steam locomotives. It was invented by Alfred Belpaire of Belgium in 1864. Today it generally refers to the shape of the outer shell of the firebox which is approximately flat at the top and squa ...

.Westcott (1960).

Original owners

USRA originals

Copies

None of the originals built under USRA auspices or any of the subsequent copies were preserved.

References

* * * * * {{DEFAULTSORT:Usra Heavy Mikado ALCO locomotives Baldwin locomotives Lima locomotives 2-8-2 locomotives USRA locomotives Freight locomotives Standard gauge locomotives of the United States Railway locomotives introduced in 1918 Scrapped locomotives